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Mr John Johnson <br /> Project 113-26-03 <br /> October 12, 1999 <br /> II• Current Activities Page 3 <br /> Groundwater samples were obtained on August 31, 1999 Prior to sampling, <br /> groundwater elevation measurements were obtained using an electric water-level <br /> meter Results are presented in the table below <br /> Table 1 - Well Data <br /> Cheaper! store#37, 15 East Grant Line Road, Tracy, California <br /> August 31, 1999 <br /> Well # Well Top Elevation Depth to GW GW Elevation* <br /> MW-1 2802 694 2108 <br /> MW-2 28 16 690 2126 <br /> MW-3 2928 800 2128 <br /> MW-4 2706 596 2110 <br /> MW-5 2746 628 2118 <br /> MW-6 2725 612 2113 <br /> MW-7 2727 626 2101 <br /> MW-8 2731 614 2117 <br /> * AlI elevations given ui feet <br /> Groundwater elevation was about 0 3 feet higher than in June 1999 The <br /> groundwater gradient was about N 8 85° W, with a gradient of 0 002667 (2 667 feet <br /> per 1,000 feet), as shown in Figure 2 <br /> In the spring, summer, and fall, groundwater flow is usually to the northeast at this <br /> site, but shifts to the southeast when water levels rise far enough This is possibly <br /> attributable to infiltration in Pescadero Park, lust northwest of the site According to <br /> Mr Dan Busch, Tracy Park Superintendent, El Pescadero Park was not designed for <br /> stormwater infiltration, but it floods in winter, rendering its sports fields unusable <br /> Each monitoring well was purged using an electric submersible pump prior to <br /> sampling At least 11 gallons were removed from MW-1, 2, 3, and 4, 6 5 Gallons <br /> were wemovrd from MW-5, 6, and 7, while 70 gallone were removed from MW-8 <br /> This was about three well volumes per well Water levels after purging have shown <br /> no significant change prior to sampling at this site All purge water was placed in a <br /> sealed metal drum Before the next well was purged and sampled, the pump was <br /> run in one bucket with TSP (trisoium phosphate) and two separate buckets with tap <br /> water All purge water and equipment wash water was placed in DOT 17H 55-gallon <br /> steel drums and remains on-site The water and drums will be disposed on your <br /> authorization with documentation forwarded upon completion <br /> After each well was purged, a sample was taken using a teflon bailer The sample <br /> water was placed in two 40-milliliter vials filled so that there was no air (head space) <br /> remaining in the vials Samples were labeled and placed on ice in a cooler for <br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 <br /> Phone (925) 439-1024 Fax (925) 439-2566 <br />